Alarm



' 1. M. BUTCHER.

ALARM. APPLICATION FILED ran. 16. 1920.

Patented Nov. 29, 1921.

UNITED STA'iLES PAT NT OFFICE.

JAMES, M. BUTCHER, or CHICAGO, rumors, ns'srenon ago SENTINEL ALARM 00., 0F

CHICAGO, ILLINOIS, A conrona'rron or ILLINOIS.

ALARM.

Specification of Letters Patent. Patented NOV. 29, 1921.

Application filed. February 16, 1920. Serial No. 358,848.

Illinois, have invented certain new and use ful Improvements in Alarms, of which the following is a specification.

This invention relates to an alarm adapted to be actuated or released by an external influence exerted upon its releasing member (usually in the form of a plunger), and particularly to that type of such alarms in ving spring and spring case with the base which a control attachment is associated with the plunger for the purpose of producing in the alarm, at will, the so-called annunciator action in which ringing continues only so long as the external influencecontinues to displace the releasing member, or continuous ringing or alarm action in which the alarm when once released by the external influence can be arrested only by voluntary act of one having access to the alarm, as, for instance, by shifting the control attachment. An alarm device performing these general functions is disclosed and broadly claimed in my Letters Patent No. 1,327,021, issued January 6th, 1920. r

The object of the present invention is to provide an improved construction of controlling attachment and other parts in an alarm of the character above described, whereby parts may be produced more cheaply without detracting from their eiiiciency or durability in use.

While an alarm having the features constituting the subject-matter of the present invention may be applied in various locations and through any one of anumber of different'mountings through which to impose the external'infiuence that is to release I the sub ect-matter of a copending' applithe alarm, it will be herein shown, for purposes of illustration, as applied through means of a mounting-adapted to coact with a door and a door jamb. In the accompanying drawing Figure 1 is a face view, of an alarm in which'the features of the present invention may be embodied, together with a mounting therefor and a door with which it is associated.

Fig. 2 is a face view of the alarm with the bell removed.v

Fig. 3 is a view similar to Fig. 2 with the main wheel and arbor removed to disclose the releasing plunger and the controlling attachment, these parts being in the position which leaves the duration of ringing under control of the external releasing influence. v

Fig. 4 is a view similar to Figs. 2 and 3 with the vibrator elements removed and with the control attachment shifted to hold the releasing plunger in continuous ring position. I

Fig. 4 is a detail view of the plunger-v spring shown in Fig. 4. V a f Fig. '5 is a face view of the alarm actuatplate and operating mechanism removed; and

Fig. 6 is a side elevation of the alarm with I and removed fromthe mounting at will.

The particular mounting herge illustrated further comprises a thrust bar 6 having an end v7 adapted to cooperate with a member between. which and the alarm relative move- 'ment takes place; also a presserfoot 8 adapted to act upon the plunger 9 for releas- "ing the bell by movement ofthe'thrust bar 6, and the thrust'baro is supported by an offset from the mounting 1 through the medium of a pair of parallel radius arms 10 flexible in the direction of movement of bar- 6 and having inherent resiliency sufficient to develop releasing pressure on the plunger 9 when the end 7 of bar 6 is left unre-. strained. i 1

The parts thus far described constitute cation executed by me of everidate-herewith and need not-be .further described herein.

' As will be seen from Fig. 3, plunger 91 .00

carries a dog 11 adapted to enter the toothed spaces of a star wheel 12, and is normally pushed into such engagement with the star wheel by means of the spring 13 having a bearing end 14: that presses beneath the off-510a set 15 of the plunger 9. The star wheel 12 is under constant driving tensionof/the spring 16 (Fig.5) exerted through the j winding post 17, main wheel 18, and multi- 1 plying wheels 19., '20, and 21. Spring 1 3 is preferably a thin metal stamping having a reduced neck 13 which adapts it to seat in a recess 22 in'the periphery ofthe base plate 22, in which recess the spring is confined by the shell 23 forming the wall of the spring chamber and within which the ceive detent 25 on control lever 26 which presents a finger-piece 27 in convenient position for manipulation, and which is mounted for movement upon the arbor bearing 28 through the medium of a split friction sleeve 29 confined by main wheel 18 (Fig. 6) and which holds the lever 26 in either of its two positions to which it may be adjusted. By appropriate pressure upon the linger-piece 27, detent 25 is introduced in position to encounter the shoulder 24 and prevent return ofthe plungerl) under the influence of spring 13. And in order that the controlling lever may beset in advance ofthe depression of plunger 9 the shoulder 2a is carried by the plunger 9 through the medium of a long resilient tongue 2 9 that yields to the detent 25 when said detent is pressed against the tongue, but which restores the shoulder 24- to its normal path of movement, and therefore in position beneath the detent 25 .as shown in Fig. 4, whenever the plunger may happen to be depressed by an external condition to be guarded against.

Movement of lever 26 in the releasing di-' 'rection may be limited by a stop 26, and

said lever is preferably arrested in. its plunger-eontrolling position by the contact of its end 2 -6 against the. arbor bearing 19. Arbor bearings 19 and 28 serve as guides for the plunger -9, which is appropriately slotted to fit over said bearings.-

. Spring l6is connectedat its driving end with the central arbor 17 which serves alike for receiving spring winding movement from the bell 5 mounted on the outer end I of said arbor, and for transmitting the spring drive to the train of wheels.) The outer end of the spring has a fixed anchorage on a tongue 30 struck from the metal of the shell 23. and engaging a slot in the above described, the alarmniaygbe set by "manipulating" the fingenpiece' 27 to the right as viewed in the drawing and thereby leave the alarm free to. automatically arrest end of the spring.

By means of the controlling attachment the'ringing Whenever the external operating influence ends, as, for instance, the closing of the door upon which'the alarm is mounted, and in this way thealarm is adapted to serve as an annunciator. Or finger-piece 27 may be manipulated to the left to press the detent 25 into the path of the shoulder 24-, displacing said shoulder for the time being, so that whenever the plunger is pressed in by the opening of the door or other object upon which the alarm is mounted, the ring ing of the alarm will continue until it runs down or until the finger-piece 27 is voluntarily shifted to the left.

I claim 1. In an alarm device, a plunge d aving an alarm-arresting position and an alarm-.

releasing position, and a controldevice movable into the path of the plunger to hold the lun er in the alarm-releasin osition" said plunger having a shoulder through which it engages the control device; and said shoulder being. resiliently supported upon the plunger whereby it yields to the control device whenthe plunger is in alarmarresting position and returns to engagementwith the control device when the plunger is in alarm-releasing position. I

2. In an alarmdevice, a plunger moving to release or arrest the alarm, a tongue carried by said plunger, and a movable detent having a path of, movement.intcrsectingthe path of saidftongue to arrest the plunger; said tongue being resilient in the di-rection of movement of the detent to permit the idetent to assume arrestin ositio'n while the tongue is across its path.

'3. In an alarm device, a plunger for releasing and arresting the action of the alarm an elon ated resilient ton 'ue carried b said ilun 'er extendin in the direction y a a of the movement thereof, and presenting" a shoulder through which to arrest the plunger, and a detentlevei' pivotally mounted upon the alarm, carrying a detent through which it intersects-the path of the tongue, and having an end presented for manipula tion of the lever.

4.111 an alarm device, a reciprocating alarm releasing member having a shoulder" which to retain it"in alarm releasing position, and means controlling said 'mem-' ber comprising a" cylindricalbearing and a lever having a sleeve frictionally embracing said bearing andextending rigidly from said sleeve to an arc intersecting'the path of said shoulder; said shoulder being supported Yon said releasing member 'Wlth rigidity in the direction of reciprocation of said member but With'resiliency in the directionof said arc- I i r Signedat- Chicago, Illinois, this l2th day of February, 1920. j y r I i JAMES, M BUTCHER, 

